Horsepower and watts are units of measure of power. They are directly proportional such that 10 horsepower is equal to 7460 watts. How much power, in watts, is equal to 3.5 horsepower?

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When two items are directly proportional, they can be written as a simple proportion:

$$ \frac{10 \text{ horsepower}}{7{,}460 \text{ watts}} = \frac{3.5 \text{ horsepower}}{x \text{ watts}} $$ $$ 10x=3.5 \cdot 7{,}460 $$ $$ x=\boxed{2{,}611}\text{ watts} $$